Definition of USB

If you're looking for the
definition of USB, you're at the right place. USB stands for
Universal Serial Bus. It's a square flat connector on just
about any computer you can find these days.
So why are there so many ports on the computer? That's
simple. Just about any device that you buy for a computer can
connect to the computer via USB. Not only is it very
universal like the name states, it's also quick and easy to connect any
device, usually without having to install any third party drivers.

Since there are so many uses for USB, most motherboards are
capable of having a ton of them. The board below has 4 on the
back of the computer, as well you can plug an additional 2 into each
expansion connector on the motherboard. It's labeled number 4
in the picture below.
The
view below is the same board without the number.

Before buying a PCI card for more USB plugs, check the
motherboard to see if it supports more like this one does.
The adapter for the motherboard will cost you a lot less.

Currently there are 3 standards of USB, just USB will give
transfer speeds of 1.43MB/s. USB 2.0 goes up dramatically to
57MB/s and the new USB 3.0 standard will give another MASSIVE jump up
to 572MB/s making this universal bus even more practical for any use
you may have for it.